CN114226713B - Thermal spraying powder, preparation method thereof and cooking utensil - Google Patents
Thermal spraying powder, preparation method thereof and cooking utensil Download PDFInfo
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- CN114226713B CN114226713B CN202111549424.XA CN202111549424A CN114226713B CN 114226713 B CN114226713 B CN 114226713B CN 202111549424 A CN202111549424 A CN 202111549424A CN 114226713 B CN114226713 B CN 114226713B
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J36/00—Parts, details or accessories of cooking-vessels
- A47J36/02—Selection of specific materials, e.g. heavy bottoms with copper inlay or with insulating inlay
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J36/00—Parts, details or accessories of cooking-vessels
- A47J36/02—Selection of specific materials, e.g. heavy bottoms with copper inlay or with insulating inlay
- A47J36/04—Selection of specific materials, e.g. heavy bottoms with copper inlay or with insulating inlay the materials being non-metallic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/026—Spray drying of solutions or suspensions
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/62605—Treating the starting powders individually or as mixtures
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/62605—Treating the starting powders individually or as mixtures
- C04B35/62645—Thermal treatment of powders or mixtures thereof other than sintering
- C04B35/62655—Drying, e.g. freeze-drying, spray-drying, microwave or supercritical drying
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/62605—Treating the starting powders individually or as mixtures
- C04B35/62695—Granulation or pelletising
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
- C23C4/08—Metallic material containing only metal elements
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
- C23C4/11—Oxides
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Chemical Kinetics & Catalysis (AREA)
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Abstract
The application provides thermal spraying powder, a preparation method thereof and a cooking utensil. The thermal spraying powder has a particle form, each particle includes a plurality of raw material particles bonded together by a binder and the plurality of raw material particles is composed of at least one of metal particles and non-metal particles, or each particle includes a single raw material particle surrounded entirely or partially by the binder at the periphery and the raw material particles are metal particles or non-metal particles. The binder is an alcohol binder. The thermal spraying powder has high fluidity.
Description
Technical Field
The present application relates to a thermal spray powder, a method of preparing a thermal spray powder, and a cooking appliance.
Background
In order to prevent the rust of the iron pan, a nonmetallic sealing layer is usually sprayed on the surface of a metal matrix of the iron pan to avoid the rust of the metal matrix, however, in the application process, the sealing layer is easy to collapse due to poor bonding force between the sealing layer and the metal matrix. Based on the above, there is a scheme of adding a metal transition layer between the surface of the metal substrate and the sealing layer in the related art, so as to solve the problem that the coating is easy to collapse.
Because the transition layer and the sealing layer are formed by adopting single metal powder or nonmetal powder through thermal spraying, the fluidity of the powder feeder in the thermal spraying equipment is mainly improved by the self-characteristics and the powder morphology of the material in the actual thermal spraying process. The powder forms are divided into broken powder and spherical powder, the fluidity of the spherical powder is higher than that of the broken powder, but the cost is far higher than that of the broken powder and can reach more than ten times. Therefore, in view of cost, thermal spraying is generally performed using crushed powder. However, this maintains the fluidity of the powder at a low level, resulting in a low amount of powder fed per unit time and a long deposition time of the thermally sprayed coating, resulting in a decrease in efficiency.
Disclosure of Invention
The present application aims to solve at least one of the technical problems in the prior art described above.
To this end, a first aspect of the present application is directed to providing a thermal spray powder.
A second aspect of the present application is directed to another thermal spray powder.
An embodiment of a third aspect of the present application is directed to a method of preparing a thermal spray powder.
A fourth aspect of the present application is directed to a cooking appliance.
To achieve the above object, a first aspect of the present invention provides a thermal spray powder having a particle form, each particle including a plurality of raw material particles bonded together by a binder, the plurality of raw material particles being composed of at least one of metal particles and non-metal particles, the binder being an alcohol-based binder. The thermal spraying powder provided by the embodiment has high fluidity, and can improve the thermal spraying efficiency and the qualification rate of thermal spraying products.
In a second aspect, embodiments of the present application provide a thermal spray powder having a particulate form, each particle comprising a single raw material particle surrounded entirely or partially by a binder, the raw material particles being metallic particles or non-metallic particles, the binder being an alcoholic binder. The thermal spraying powder provided by the embodiment has high fluidity, and can improve the thermal spraying efficiency and the qualification rate of thermal spraying products.
In addition, the thermal spraying powder provided by the embodiments of the first aspect and/or the embodiments of the second aspect of the present application may further have the following additional technical features:
in some embodiments, the binder comprises a polyvinyl alcohol binder or a polyacrylic alcohol binder.
In some embodiments, the metal particles range in size from 20 μm to 50 μm. Each particle is defaulted herein to include metal particles as raw material particles.
In some embodiments, the nonmetallic particles range in size from 1 μm to 10 μm. Each particle is defaulted herein to include nonmetallic particles as raw material particles.
In some embodiments, the mass ratio of the plurality of raw material particles to the binder ranges from 30:1 to 50:1 for each particle. Where each particle is defaulted to include a plurality of raw material particles bonded together by a binder.
In some embodiments, the plurality of raw material particles of each particle consists of metallic particles and non-metallic particles. Further, the weight of the non-metallic particles is less than or equal to 20% of the total weight of the plurality of raw material particles based on the total weight of the particles, the outer sides of the metallic particles being fully or partially surrounded by the non-metallic particles.
In some embodiments, the metal particles comprise one or more of titanium particles, titanium alloy particles, iron particles, stainless steel particles, mild steel particles, high carbon steel particles, cast iron particles, copper alloy particles, aluminum alloy particles, nickel particles, or nickel alloy particles.
In some embodiments, the non-metallic particles comprise metal oxide particles. The metal oxide particles include one or more of titanium oxide particles, titanium nitride particles, titanium carbide particles, ferroferric oxide particles, ferric oxide particles, ferrous oxide particles, aluminum oxide particles, chromium oxide particles, and nickel oxide particles.
An embodiment of a third aspect of the present application provides a method for preparing a thermal spray powder, comprising the steps of: preparing a suspension, and adding a powder material comprising a plurality of raw material particles to a binder to form the suspension, wherein the raw material particles consist of at least one of metal particles and nonmetal particles, and the binder is an alcohol binder; spraying, namely atomizing the suspension to form liquid drops on a rotating disc with a certain rotating speed; drying, namely drying the atomized liquid drops to enable at least two raw material particles in the powder material to be bonded together through a binder to form dry powder particles, or enabling single raw material particles in the powder material to be fully or partially wrapped by the binder to form dry powder particles; sintering, namely introducing the dried powder particles into a sintering chamber for sintering; and screening, namely screening the sintered powder particles, and reserving the powder particles with the particle size larger than a preset value, thereby obtaining the thermal spraying powder in the form of particles.
In the method for preparing the thermal spraying powder provided by the embodiment, the powder material with a plurality of raw material particles is added into the binder to form a suspension, and then the suspension is guided into the atomizing chamber for atomization, and the atomization process can be regarded as the initial stage of bonding the raw material particles and the binder together. In this process, the binder is in a liquid state and adheres to the raw material particles. And then drying the atomized suspension, so that a plurality of raw material particles bonded with the adhesive can collide with each other and be bonded, the raw material particles are bonded together through the adhesive, and then the powder particles of the raw material particles bonded together through the adhesive are obtained through sintering and screening, so that the preparation is convenient. Of course, during the drying process, the individual raw material particles may also be entirely or partially wrapped with the binder without being bonded with other raw material particles, thereby obtaining powder particles of the individual raw material particles entirely or partially wrapped with the binder on the periphery thereof by sintering. Finally, the thermal spraying powder of the required type is obtained through screening, the thermal spraying powder has high fluidity, and the thermal spraying efficiency and the qualification rate of the thermal spraying product can be improved.
In some embodiments, the step of adding a powder material comprising a plurality of raw material particles to a binder to form a suspension comprises: adding the powder material into the binder according to the mass ratio of the powder material to the binder ranging from 15:1 to 25:1, and uniformly stirring to form suspension.
In some embodiments, the binder comprises a polyvinyl alcohol binder or a polyacrylic alcohol binder.
In some embodiments, the metal particles range in size from 20 μm to 50 μm. The default powder material here includes metal particles as raw material particles.
In some embodiments, the nonmetallic particles range in size from 1 μm to 10 μm. The default powder material here includes nonmetallic particles as raw material particles.
In some embodiments, the plurality of raw material particles consists of metal particles and non-metal particles, wherein the weight of the non-metal particles is 20% or less of the total weight of the plurality of raw material particles.
In some embodiments, the metal particles include one or more of titanium particles, titanium alloy particles, iron particles, stainless steel particles, low carbon steel particles, high carbon steel particles, cast iron particles, copper alloy particles, aluminum alloy particles, nickel particles, and nickel alloy particles.
In some embodiments, the non-metallic particles comprise metal oxide particles. The metal oxide particles include one or more of titanium oxide particles, titanium nitride particles, titanium carbide particles, ferroferric oxide particles, ferric oxide particles, ferrous oxide particles, aluminum oxide particles, chromium oxide particles, and nickel oxide particles.
In some embodiments, in the step of sintering, the sintering temperature ranges from 80 ℃ to 200 ℃. The sintering time ranges from 10min to 60min.
An embodiment of a fourth aspect of the present application provides a cooking appliance, including: the pot body, the surface of the pot body has corrosion-resistant layer, corrosion-resistant layer is by the thermal spraying powder spraying of any one of above-mentioned technical scheme in pot body structure. High production efficiency and high product qualification rate.
Drawings
The foregoing and other objects and features of the present application will become more apparent from the following description of embodiments of the present application, taken in conjunction with the accompanying drawings in which:
FIG. 1 shows a process flow diagram of a method of preparing a thermal spray powder according to one embodiment of the present application.
Detailed Description
Specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the specific embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The present application provides a thermal spray powder having a particulate form, which for one thermal spray powder particle of unit magnitude for thermal spraying can be constructed from a plurality of raw material particles bonded together or from a single raw material particle fully or partially surrounded by a binder. In the case where one particle is configured of a plurality of raw material particles bonded together, the particle may be configured of a plurality of raw material particles of different kinds, for example, metal particles+nonmetal particles, of course, metal particles of different metals, for example, metal a particles+metal B particles, or nonmetal particles of different nonmetal, for example, nonmetal C particles+nonmetal D particles, and may be configured of a plurality of raw material particles of the same kind, for example, metal a particles+metal a particles, or the like.
Embodiments of the first aspect of the present application provide a thermal spray powder having high flowability and capable of improving thermal spray efficiency and yield of thermal spray products. According to the present embodiment, the thermal spraying powder has a particle form, each particle including a plurality of raw material particles bonded together by a binder, wherein the plurality of raw material particles is composed of at least one of metal particles and non-metal particles, and the binder is an alcohol-type binder.
By pretreating the raw material particles, a plurality of raw material particles are bonded together beforehand by a binder and then a thermal spray powder in the form of particles is formed. Because the density of the binder is smaller than that of the raw material particles, the weight of the raw material particles in the unit volume of the particles is reduced, so that even if the unit volume of the thermal spraying powder in the thermal spraying equipment is too much or the vibration of the thermal spraying equipment is unstable, the powder feeding is not smooth due to the compaction problem, the problems of shutdown and the like caused by blocking of the gun nozzle by powder agglomeration can be effectively avoided, the qualification rate of the product is ensured, and the thermal spraying efficiency is ensured. In addition, the thermal spraying powder formed by a single raw material particle may have many edges and corners, and the powder particle formed by bonding a plurality of raw material particles by using the binder can cover a part of the edges and corners of the raw material particle on one hand and can fill gaps among the edges and corners of the raw material particle on the other hand, so that the roundness of the powder particle is greatly improved, the fluidity of the powder particle is improved, and the thermal spraying efficiency is ensured. In addition, each particle comprises a plurality of raw material particles, so that the probability of poor flowability due to soft texture of the powder particles because the binder occupies a relatively large amount in the powder particles can be reduced. Moreover, since the thermal spraying powder provided by the embodiment has higher fluidity, even if raw material particles in the form of broken powder are selected, even if each particle comprises a plurality of raw material particles in the form of broken powder, higher thermal spraying efficiency can be ensured, and the qualification rate of thermal spraying products can be ensured.
According to the present embodiment, the plurality of raw material particles may include at least one of metal particles and non-metal particles, which is advantageous in designing the kind of raw material particles as needed so that the thermal spray powder can have good binding force with the metal substrate or have corrosion resistance. In addition, the binder is selected as an alcohol binder, and the vaporization point of the binder is lower and is generally lower than 350 ℃, and the high temperature exists in the thermal spraying process and generally reaches more than 1000 ℃, so that the binder can volatilize automatically in the thermal spraying process and can not remain in a coating formed by thermal spraying, the stress of the coating can be reduced, and the coating is prevented from being broken.
The binder includes, as an example, a polyvinyl alcohol binder or a polypropylene alcohol binder. The polyvinyl alcohol binder and the polypropylene alcohol binder can firmly bond a plurality of raw material particles, the vaporization point is low, the polyvinyl alcohol binder and the polypropylene alcohol binder can not remain in a coating formed by thermal spraying, the stress of the coating can be reduced, and the collapse of the coating is avoided.
As an example, the mass ratio of the plurality of raw material particles to the binder ranges from 30:1 to 50:1 for each particle. If the mass ratio of the binder is too small, the amount of the binder is insufficient and the improvement of fluidity is not obvious. If the mass ratio of the binder is too large, the strength of a coating formed after thermal spraying is low, and the problems of corrosion resistance reduction, short service life and the like are easily caused by abrasion. Therefore, the mass ratio of all raw material particles to binder in each particle is between 30:1 and 50:1, so that the structural strength, the wear resistance and the corrosion resistance of the coating can be ensured under the condition of effectively bonding a plurality of raw material particles, and the service life of the coating can be ensured.
As an example, the particle size of the thermal spray powder ranges from 20 μm to 150 μm. If the particle size of the particles is larger, the appearance attractiveness of the coating formed by thermal spraying is affected, and if the particle size of the particles is smaller, the problems of particle oxidation, particle blowing away by high-pressure gas in the thermal spraying process and the like caused by over-burning in the thermal spraying process are easily caused, so that the corrosion resistance of the coating and the particle utilization rate are affected. Therefore, the particle size of each thermal spraying powder is between 20 and 150 mu m, the phenomenon of overburning in the thermal spraying process can be effectively avoided, and the appearance beautification degree of the coating is ensured.
In addition, if the particle size of the particles is small, the particle size of the raw material particles forming the particles is also small, and the particles are easy to agglomerate in a concentrated manner in the atomization process of preparing the thermal spraying powder, so that the powder forming rate of the final thermal spraying powder is affected. If the particle diameter of the particles is large, the particle diameter of a part of the raw material particles forming the particles is also large, and in the atomizing step of preparing the thermal spray powder, atomization is difficult, and the yield is low, resulting in high cost. Therefore, the particle size of each thermal spraying powder is between 20 and 150 mu m, which is convenient for preparation and atomization and reduces the cost.
In a specific embodiment, the plurality of raw material particles of each particle consists of metallic particles and nonmetallic particles. The bonding performance of the metal particles and the metal matrix is good, the non-metal particles cannot rust and are bonded with the metal particles through the adhesive, so that the probability of oxidization caused by exposure of the metal particles is reduced, the coating formed by thermal spraying of the thermal spraying powder has good bonding force and good corrosion resistance, a transition layer and a sealing layer double layer are not required to be arranged, repeated spraying is not required, the preparation process of the metal matrix antirust coating is simplified, and the cost is saved.
According to a preferred embodiment of the present invention, the metal particles are iron-free metal particles, and the corrosion resistance effect is good.
Further, the weight of the non-metallic particles is less than or equal to 20% of the total weight of the plurality of raw material particles based on the total weight of the particles. When the content is more than 20%, the economic value brought by fluidity is less than the granulating cost, so that the original purpose of improving the efficiency and further improving the economy is overcome; when the number of the nonmetallic particles is 0, the thermal spraying powder is in a form that the metal particles are completely or partially wrapped by the binder, and the powder fluidity can be improved to a certain extent. Therefore, the mass ratio of the nonmetallic particles to the sum of the raw material particles is controlled to be less than or equal to 20%, so that the comprehensive economic value can be improved, and the cost can be reduced.
Further, the outer sides of the metal particles are fully or partially wrapped by the nonmetallic particles, so that the probability of oxidization caused by exposure of the metal particles can be reduced, and the corrosion resistance of the thermal spraying powder and a coating formed after the thermal spraying powder is subjected to thermal spraying can be improved.
Further, the particle size of the metal particles is larger than that of the nonmetal particles, so that more nonmetal particles can be fully attached to the outer sides of the metal particles, the metal particles are fully shielded, and the probability of oxidization due to exposure of the metal particles is reduced. In addition, the particle size of the nonmetallic particles is smaller, so that the nonmetallic particles are favorably and firmly attached to the metallic particles, and the nonmetallic particles are prevented from being separated from the metallic particles due to larger volume and larger mass.
Further, the metal particles may have a particle size ranging from 20 μm to 50 μm and the plurality of nonmetallic particles may have a particle size ranging from 1 μm to 10 μm. If the particle size of the nonmetallic particles is larger, on one hand, the materials are increased, and the production cost is increased; on the other hand, under the condition that a plurality of nonmetallic particles wrap the metallic particles, the size of the nonmetallic particles is limited, and the quantity of the nonmetallic particles can be reduced, so that gaps on the periphery of the metallic particles are larger, the metallic particles are easier to contact with the outside air, and the corrosion resistance is influenced. Therefore, the particle size of each nonmetallic particle is less than or equal to 10 mu m, so that the cost can be effectively reduced, and the corrosion resistance and the rust resistance of the coating formed after the thermal spraying powder is thermally sprayed are ensured. In addition, if the particle diameter of the nonmetallic particles is too small, the processing cost of the particles is greatly increased. Therefore, the particle size of each nonmetallic particle is more than or equal to 1 mu m, so that the nonmetallic particle can be ensured to fully wrap the metallic particle, the corrosion resistance is ensured, and the cost is reduced.
In particular applications, the metal particles may include one or more of titanium particles, titanium alloy particles, iron particles, stainless steel particles, low carbon steel particles, high carbon steel particles, cast iron particles, copper alloy particles, aluminum alloy particles, nickel particles, and nickel alloy particles.
In particular applications, the non-metallic particles are metal oxide particles, such as one or more of titanium oxide particles, titanium nitride particles, titanium carbide particles, ferroferric oxide particles, ferric oxide particles, ferrous oxide particles, aluminum oxide particles, chromium oxide particles, and nickel oxide particles.
In another specific embodiment, the plurality of raw material particles of each particle may be composed of only metal particles. The metal particles may include one or more of titanium particles, titanium alloy particles, iron particles, stainless steel particles, mild steel particles, high carbon steel particles, cast iron particles, copper alloy particles, aluminum alloy particles, nickel particles, and nickel alloy particles.
In another specific embodiment, the plurality of raw material particles of each particle may be composed of only nonmetallic particles. The nonmetallic particles may include one or more of titanium oxide particles, titanium nitride particles, titanium carbide particles, ferroferric oxide particles, ferric oxide particles, ferrous oxide particles, aluminum oxide particles, chromium oxide particles, and nickel oxide particles.
In a second aspect, embodiments of the present application provide a thermal spray powder having a particulate form, each particle comprising: the periphery of the single raw material particles is fully or partially wrapped by a binder, and the binder is an alcohol binder.
The thermal spraying powder provided by the embodiment has high fluidity, and can improve the thermal spraying efficiency and the qualification rate of thermal spraying products. Specifically, raw material particles are pre-treated to be wrapped by a binder in advance, and the weight of the raw material particles in a unit volume in powder particles is reduced because the density of the binder is smaller than that of the raw material particles, so that even if the amount of hot spraying powder in the unit volume in the hot spraying equipment is too large or the vibration of the hot spraying equipment is unstable, the powder feeding is not smooth due to compaction, and therefore the problems of shutdown and the like caused by blocking of powder caking by a gun nozzle of the hot spraying equipment can be effectively avoided, the qualification rate of products is ensured, and the hot spraying efficiency is ensured. Moreover, the thermal spraying powder formed by a single raw material particle may have many edges and corners, and the raw material particle is bonded by the binder, so that on one hand, the binder can cover a part of the edges and corners of the raw material particle, and on the other hand, the binder can fill gaps among the edges and corners of the raw material particle, thereby greatly improving the roundness of the thermal spraying powder, improving the fluidity of the powder particle and ensuring the thermal spraying efficiency. Moreover, since the thermal spraying powder provided by the embodiment has higher fluidity, even if raw material particles in the form of broken powder are selected, even if each particle comprises single raw material particles in the form of broken powder, higher thermal spraying efficiency can be ensured, and the qualification rate of thermal spraying products can be ensured.
According to the present embodiment, the raw material particles may include metal particles or nonmetal particles, which is advantageous in designing the kind of raw material particles as needed. If the raw material particles are metal particles, the periphery of the metal particles is wrapped by the adhesive, so that the thermal spraying powder can have good binding force with the metal matrix and has corrosion resistance. In addition, the binder is an alcohol binder, and the vaporization point of the binder is lower and is generally lower than 350 ℃, and the high temperature exists in the thermal spraying process and generally reaches more than 1000 ℃, so that the binder can volatilize automatically in the thermal spraying process and can not remain in a coating formed by thermal spraying, the stress of the coating can be reduced, and the coating is prevented from being broken.
Optionally, the binder comprises a polyvinyl alcohol binder or a polypropylene alcohol binder.
Alternatively, the individual raw material particles are metal particles. Such as any one of titanium particles, titanium alloy particles, iron particles, stainless steel particles, low carbon steel particles, high carbon steel particles, cast iron particles, copper alloy particles, aluminum alloy particles, nickel particles, and nickel alloy particles. The metal particles have a particle size in the range of 20 μm to 50 μm.
Alternatively, the individual raw material particles are nonmetallic particles. For example, metal oxide particles such as, in particular, any one of titanium oxide particles, titanium nitride particles, titanium carbide particles, ferric oxide particles, ferrous oxide particles, aluminum oxide particles, chromium oxide particles, and nickel oxide particles. The particle size of the nonmetallic particles ranges from 1 μm to 10 μm.
Hereinafter, a method for preparing a thermal spray powder according to an embodiment of the third aspect of the present application, which can prepare the thermal spray powder according to the embodiments of the first and second aspects, will be described with reference to fig. 1.
FIG. 1 shows a process flow diagram of a method of preparing a thermal spray powder according to one embodiment of the present application. Referring to fig. 1, in step S10, a suspension is disposed: a powder material comprising a plurality of raw material particles is added to a binder to form a suspension, wherein the plurality of raw material particles consists of at least one of metal particles and non-metal particles, and the binder is an alcohol-based binder.
As an example, the powder material is added to the binder in a mass ratio of the powder material to the binder ranging from 15:1 to 25:1, and stirred uniformly to form a suspension. If the mass ratio of the binder is too small, the binder is insufficient, so that a plurality of raw material particles are easily bonded to be infirm or are not fully wrapped, and the coating formed after the thermal spraying powder is subjected to thermal spraying is insufficient in rust prevention and easy to collapse. If the mass ratio of the binder is too large, the strength of the coating formed after thermal spraying is low, and the problems of corrosion resistance reduction, short service life and the like are easily caused by abrasion. Furthermore, a portion of the binder in the final formed thermal spray powder particles is lost through the atomization and drying steps. Therefore, the adhesive is added according to the mass ratio of the powder material to the adhesive ranging from 15:1 to 25:1, so that raw material particles can be effectively bonded and wrapped, and excessive waste of the adhesive is avoided. In addition, the mass ratio of the raw material particles to the binder in the prepared thermal spraying powder particles is between 30:1 and 50:1, so that the structural strength, the wear resistance and the corrosion resistance of a coating formed after thermal spraying are ensured, and the service life of the coating is ensured.
As an example, the binder is an alcohol-based binder. For example, the binder includes a polyvinyl alcohol binder or a polypropylene alcohol binder. The vaporization point of the binder is lower and is generally lower than 350 ℃, and high temperature exists in the thermal spraying process, so that the binder can volatilize automatically in the thermal spraying process and can not remain in a coating formed by thermal spraying, the stress of the coating can be reduced, and the coating is prevented from being broken. But also firmly adheres to the raw material particles.
As an example, the plurality of raw material particles include metal particles or non-metal particles. In this case, the individual particles of the sieved thermal spray powder may include individual raw material particles wrapped with the binder, or may include a plurality of raw material particles bonded together by the binder.
As an example, the plurality of raw material particles include metal particles and non-metal particles, and in this case, the individual particles of the sieved thermal spray powder may include metal particles and non-metal particles, and the outer sides of the metal particles are entirely or partially surrounded by the non-metal particles. Namely, metal particles and nonmetal particles are added into the binder, and each finally formed particle comprises the metal particles and nonmetal particles, and the metal particles and the metal matrix have good bonding performance, but the nonmetal particles cannot rust, and the binder is adhered with the metal particles, so that the probability of oxidization due to exposure of the metal particles is reduced, and the coating formed by thermal spraying of the thermal spraying powder has good bonding force and good corrosion resistance. And the double layers of the transition layer and the sealing layer are not required to be arranged, repeated spraying is not required, the preparation process of the metal matrix antirust coating is simplified, and the cost is saved.
Further, the metal particles are iron-free metal particles, and the corrosion resistance effect is good.
As an example, the plurality of raw material particles are composed of metal particles and nonmetallic particles, wherein the weight of nonmetallic particles is 20% or less of the total weight of the plurality of raw material particles. When the content is more than 20%, the economic value brought by fluidity is less than the granulating cost, so that the initial aim of improving the efficiency and further improving the economy is overcome; when the number of the nonmetallic particles is 0, the thermal spraying powder is in a form that the metal particles are completely or partially wrapped by the binder, and the powder fluidity can be improved to a certain extent. Therefore, the mass ratio of the nonmetallic particles to the sum of the raw material particles is less than or equal to 20%, so that the comprehensive economic value can be improved, and the cost can be reduced.
Further, the particle size of the metal particles is larger than the particle size of the non-metal particles. The method is favorable for more nonmetallic particles to be fully attached to the outer sides of the metallic particles and fully shield the metallic particles, so that the probability of oxidization of the metallic particles due to exposure is reduced, and the corrosion resistance of the thermal spraying powder and a coating formed after the thermal spraying powder is thermally sprayed is improved. In addition, the particle size of the nonmetallic particles is smaller, so that the nonmetallic particles are favorably and firmly attached to the metallic particles, and the nonmetallic particles are prevented from being separated from the metallic particles due to larger volume and larger mass.
Further, the metal particles have a particle diameter ranging from 20 μm to 50 μm. The plurality of nonmetallic particles have a particle size ranging from 1 μm to 10 μm. If the particle size of the nonmetallic particles is larger, on one hand, the materials are increased, and the production cost is increased; on the other hand, under the condition that a plurality of nonmetallic particles wrap the metallic particles, the size of the nonmetallic particles is limited, and the quantity of the nonmetallic particles can be reduced, so that gaps on the periphery of the metallic particles are larger, the metallic particles are easier to contact with the outside air, and the corrosion resistance is influenced. Therefore, the particle size of each nonmetallic particle is less than or equal to 10 mu m, so that the cost can be effectively reduced, and the corrosion resistance and the rust resistance of the coating formed after the thermal spraying powder is thermally sprayed are ensured. In addition, if the particle size of the nonmetallic particles is too small, the processing cost of the particles can be greatly increased, increasing the cost of the thermal spray powder. Therefore, the particle size of each nonmetallic particle is more than or equal to 1 mu m, so that the nonmetallic particle can be ensured to fully wrap the metallic particle, the corrosion resistance is ensured, and the cost is reduced.
As an example, the metal particles may be one or more of titanium particles, titanium alloy particles, iron particles, stainless steel particles, low carbon steel particles, high carbon steel particles, cast iron particles, copper alloy particles, aluminum alloy particles, nickel particles, and nickel alloy particles. Non-metal oxide particles. The metal oxide particles include one or more of titanium oxide particles, titanium nitride particles, titanium carbide particles, ferroferric oxide particles, ferric oxide particles, ferrous oxide particles, aluminum oxide particles, chromium oxide particles, and nickel oxide particles.
Referring to fig. 1, in step S20, spraying: and atomizing the suspension to form drops on the turntable at a certain rotation speed.
Referring to fig. 1, in step S30, drying: the atomized droplets are dried to bond the plurality of raw material particles in the powder material together via the binder to form dried powder particles, or to encapsulate the individual raw material particles in the powder material entirely or partially with the binder to form dried powder particles.
Referring to fig. 1, in step S40, sintering: and (3) introducing the dried powder particles into a sintering chamber for sintering.
As an example, in the step of sintering, the sintering temperature ranges from 80 ℃ to 200 ℃. The sintering time ranges from 10min to 60min. If the sintering temperature is too low, the powder is easy to agglomerate, and the powder forming rate is affected. If the sintering temperature is too high, the preparation cost is increased, and the powder forming rate is not obviously improved. If the sintering time is too short, the powder is easy to agglomerate and influence the powder forming rate. If the sintering time is too long, the preparation cost is increased, and the powder forming rate is not obviously improved. In general, the higher the sintering temperature, the shorter the sintering time. Therefore, the sintering temperature is 80-200 ℃, the sintering time is 10-60 min, and the preparation cost can be reduced under the condition of ensuring the powder forming rate.
Referring to fig. 1, in step S50, screening: and screening the sintered powder particles, and reserving the powder particles with the particle size larger than a preset value, thereby obtaining the thermal spraying powder in the form of particles. It is advantageous to ensure that the resulting thermal spray powder for thermal spraying each includes a plurality of raw material particles or each includes a single raw material particle, and can be screened as needed, and to ensure fluidity of the thermal spray powder.
As an example, the predetermined value may be a particle diameter value of a largest raw material particle among the plurality of raw material particles. When the particle diameter of the powder particles is larger than the predetermined value, it can be judged that the raw material particles are bound with the binder, not the simple raw material particles. Or the predetermined value is the particle diameter value of the largest raw material particle plus the thickness of the binder, so that the thermal spray powder obtained by screening each includes a plurality of raw material particles bonded together. The desired thermal spray powder can be obtained by sieving.
As an example, the particle size range of the thermal spray powder obtained after screening is 20 μm to 150 μm. That is, the preset value is in the range of 20 μm to 150 μm, if the particle size of the thermal spraying powder is large, the appearance aesthetic degree of the coating formed by thermal spraying is affected, and if the particle size of the thermal spraying powder is small, problems such as particle oxidation caused by over-burning, blowing away of particles by high-pressure gas in the thermal spraying process and the like easily occur in the thermal spraying process, and the corrosion resistance and the particle utilization rate of the coating are affected. Therefore, the particle size of each thermal spraying powder is between 20 and 150 mu m, the phenomenon of overburning in the thermal spraying process can be effectively avoided, and the appearance beautification degree of the coating is ensured.
In addition, if the particle size of the thermal spray powder is small, the particle size of the raw material particles forming the thermal spray powder is also small, and the agglomeration is easily concentrated in the atomization process of preparing the thermal spray powder, which affects the powder forming rate of the final powder. If the particle size of the thermal spray powder is large, the particle size of a part of the raw material particles forming the thermal spray powder is also large, and in the atomizing step of preparing the thermal spray powder, atomization is difficult, and the yield is low, resulting in high cost. Therefore, the particle size of each thermal spraying powder is between 20 and 150 mu m, which is convenient for preparation and atomization and reduces the cost.
According to the preparation method of the thermal spraying powder, powder materials with a plurality of raw material particles are added into a binder to form a suspension, then the suspension is guided into an atomization chamber to be atomized, the atomization process can be regarded as the initial stage of bonding the particles and the binder together, and in the process, the binder is in a liquid state, and the particles are bonded together. And then drying the atomized suspension, so that a plurality of raw material particles bonded with the adhesive can collide with each other and be bonded, the raw material particles are bonded together through the adhesive, and then the powder particles of the raw material particles bonded together through the adhesive are obtained through sintering, so that the preparation is convenient. Of course, during the drying process, the individual raw material particles may also be entirely or partially wrapped with the binder without being bonded with other raw material particles, thereby obtaining powder particles of the individual raw material particles entirely or partially wrapped with the binder on the periphery thereof by sintering.
Because the density of the binder is smaller than that of the particles, the weight of the particles in the unit volume of the powder particles can be reduced, so that even if the powder particles in the unit volume of the thermal spraying equipment are too many or the thermal spraying equipment vibrates unstably, the compaction problem is not easy to cause and the powder feeding is not smooth, the problems of shutdown and the like caused by blocking of powder agglomeration by a gun nozzle of the thermal spraying equipment can be effectively avoided, the qualification rate of products is ensured, and the thermal spraying efficiency is ensured. Moreover, the powder particles formed by the single raw material particles have a plurality of edges and corners, and the raw material particles are bonded by the binder, so that on one hand, the binder can cover part of the edges and corners of the raw material particles, and on the other hand, the binder can fill gaps among the edges and corners of the raw material particles, thereby greatly improving the roundness of the powder particles, improving the fluidity of the powder particles and ensuring the thermal spraying efficiency. Moreover, because the prepared powder particles have higher fluidity, even if raw material particles in the form of broken powder are selected, even if each powder particle comprises a plurality of raw material particles in the form of broken powder, higher thermal spraying efficiency can be ensured, and the qualification rate of thermal spraying products can be ensured. In addition, any one of the raw material particles is made to be metal particles or nonmetal particles, which is beneficial to designing the types of the raw material particles according to the needs, so that the thermal spraying powder can have good binding force with a metal matrix or have corrosion resistance. In addition, the binder is an alcohol binder, and the vaporization point of the binder is lower and is generally lower than 350 ℃, and the high temperature is generally higher than 1000 ℃ in the thermal spraying process, so that the binder can volatilize automatically in the thermal spraying process and can not remain in a coating formed by thermal spraying, the stress of the coating can be reduced, and the coating is prevented from being broken.
Of course, in the case where each of the powder particles includes a plurality of raw material particles, the binder does not occupy a large amount in the powder particles, and the probability of poor flowability of the powder particles due to soft texture can be reduced.
The main purpose of the present invention is to improve the flowability of the powder, and the factors affecting the flowability of the powder in the present application are as follows:
(1) The higher the binder ratio, the better the flowability, but exceeding the upper limit of the range required in the present application tends to result in a decrease in the granulation yield, affecting the final cost.
(2) The higher the non-metallic material ratio, the better the fluidity; since the fluidity of nonmetallic materials is greater than that of metallic materials at the same particle size, the main reason for introducing nonmetallic materials in this application is to promote fluidity.
Hereinafter, the method for preparing the thermal spray powder according to some embodiments of the present application will be described in detail.
The powder flowability is measured by using the repose angle measuring method, and the smaller the angle is, the better the flowability is.
Specifically, the specific parameters of the following embodiments are brought into the corresponding steps of the above steps S10 to S50.
Example 1:
(1) Selecting raw material particle titanium, particle size range about 40 μm, and binder polyvinyl alcohol.
(2) The preparation method comprises the following steps of: the slurry is prepared into slurry, and the ratio of raw material particles to binder in the slurry is 20:1.
(3) The slurry is conveyed to a high-speed liquid throwing disc at 8000 revolutions per minute, then the slurry is thrown out by the liquid throwing disc to form a liquid drop, then the liquid drop is blown into a drying tower at 150 ℃ by hot air at 80 ℃, the temperature is kept for 5H, and the final powder with the particle size range of 40-60 mu m is obtained through screening, wherein the binder accounts for 2.5% of the final powder, and the final powder is thermal spraying powder particles formed by single titanium particles with the outer sides being fully or partially wrapped by the binder.
Example 2:
unlike in example 1, the binder content in the final powder was 2wt%.
Example 3:
unlike in example 1, the binder content in the final powder was 3wt%.
The above examples 1 to 3 propose a method for producing thermal spray powder particles constituted by single titanium particles whose periphery is entirely or partially surrounded by a binder. Of course, the rotational speed of the high-speed liquid-shedding disc can also be increased, and the screening preset value can be changed to obtain the thermal spraying powder particles formed by a plurality of titanium particles bonded together through the adhesive, which are not described in detail herein.
Example 4:
Selecting raw material particles of which the weight ratio is 9:1 and the particle size range (the particle size of titanium is about 30 mu m, the particle size of titanium oxide is about 5 mu m) and binder of which the weight ratio is 20:1, and preparing slurry according to raw material slurry; the slurry is conveyed to a high-speed liquid throwing disc with the speed of 7500 r/min, then the slurry is thrown out by the liquid throwing disc to form a dropping liquid, then the dropping liquid is blown into a drying tower with the temperature of 150 ℃ by hot air with the temperature of 80 ℃, the temperature is kept for 4.5H, and the final powder with the particle size range of 40-60 mu m is obtained through screening, wherein the binder ratio of the final powder is 2.5%, the titanium oxide ratio of the final powder is 10.8%, and a plurality of titanium oxide particles in the final powder are coated with the titanium particles through the binder.
Example 5:
unlike in example 4, the binder content in the final powder was 2wt%. The titanium oxide content of the final powder was 2.3wt%.
Example 6:
unlike in example 4, the binder content in the final powder was 3wt%. The titanium oxide content of the final powder was 18.9wt%.
Comparative example 1:
titanium powder, i.e. titanium raw material particles, having a particle size in the range of 40 to 60 μm.
Comparison table:
| example | Angle of repose (°) |
| Example 1 | 38 |
| Example 2 | 41 |
| Example 3 | 35 |
| Example 4 | 35 |
| Example 5 | 37 |
| Example 6 | 32 |
| Comparative example 1 | 55 |
As is clear from the comparison table, the repose angle of the finally formed thermal spraying powder particles is smaller than that of the titanium powder which is not pretreated in the prior art, and the fluidity of the thermal spraying powder particles is improved by carrying out the pretreatment on the raw material particles, whether the single titanium particles are fully or partially wrapped by the binder or the titanium oxide particles are wrapped outside the titanium particles by the binder.
An embodiment of a fourth aspect of the present application provides a cooking appliance, including: the pot body, the surface of the pot body has corrosion resistant layer, corrosion resistant layer is by the thermal spraying powder spraying of any one of the above-mentioned embodiments in the construction of pot body. Because the thermal spraying powder has high spraying efficiency and high fluidity, the production efficiency and the product qualification rate of the cooking utensil can be improved.
Further, the cooking appliance is an electric pressure cooker, an electric rice cooker, an air fryer or a frying pan, and the like.
While certain embodiments have been shown and described, it will be appreciated by those skilled in the art that changes and modifications may be made in these embodiments (e.g., different features described in the different embodiments may be combined) without departing from the principles and spirit of the application, the scope of which is defined in the claims and their equivalents.
Claims (7)
1. A thermal spray powder, characterized in that the thermal spray powder has a particulate form, each particle comprising a plurality of raw material particles bound together by a binder, wherein the plurality of raw material particles of each particle consists of metal particles and non-metal particles, wherein the weight of the non-metal particles is less than or equal to 20% of the total weight of the plurality of raw material particles, based on the total weight of particles, the outer side of the metal particles being wholly or partially surrounded by the non-metal particles;
the binder is an alcohol binder;
wherein the metal particles have a particle size in the range of 20 μm to 50 μm and the non-metal particles have a particle size in the range of 1 μm to 10 μm, and the mass ratio of the plurality of raw material particles to the binder is 30:1 to 50:1 for each particle;
wherein the metal particles comprise one or more of titanium particles, titanium alloy particles, iron particles, stainless steel particles, low carbon steel particles, high carbon steel particles, cast iron particles, copper alloy particles, aluminum alloy particles, nickel particles, and nickel alloy particles;
the nonmetallic particles are metal oxide particles, and the metal oxide particles comprise one or more of titanium oxide particles, titanium nitride particles, titanium carbide particles, ferroferric oxide particles, ferric oxide particles, ferrous oxide particles, aluminum oxide particles, chromium oxide particles and nickel oxide particles.
2. A thermal spray powder, wherein the thermal spray powder has a particulate form, each particle comprising a single raw material particle surrounded entirely or partially by a binder, the raw material particles being metallic particles or non-metallic particles, the binder being an alcoholic binder;
wherein the metal particles have a particle diameter ranging from 20 μm to 50 μm, the nonmetallic particles have a particle diameter ranging from 1 μm to 10 μm, the mass ratio of the raw material particles to the binder is 30:1 to 50:1 for each particle,
the metal particles comprise one or more of titanium particles, titanium alloy particles, iron particles, stainless steel particles, low carbon steel particles, high carbon steel particles, cast iron particles, copper alloy particles, aluminum alloy particles, nickel particles and nickel alloy particles;
the nonmetallic particles are metal oxide particles, and the metal oxide particles comprise one or more of titanium oxide particles, titanium nitride particles, titanium carbide particles, ferroferric oxide particles, ferric oxide particles, ferrous oxide particles, aluminum oxide particles, chromium oxide particles and nickel oxide particles.
3. Thermal spray powder according to claim 1 or 2, characterized in that,
The binder comprises a polyvinyl alcohol binder or a polypropylene alcohol binder.
4. A method of preparing a thermal spray powder comprising the steps of:
preparing a suspension: adding a powder material including a plurality of raw material particles to a binder to form a suspension, wherein the step of adding the powder material including the plurality of raw material particles to the binder to form the suspension includes: adding the powder material into the binder according to the mass ratio of the powder material to the binder ranging from 15:1 to 25:1, uniformly stirring to form a suspension, wherein the raw material particles consist of metal particles and nonmetal particles, the weight of the nonmetal particles is less than or equal to 20% of the total weight of the raw material particles, the particle size of the metal particles ranges from 20 mu m to 50 mu m, and the particle size of the nonmetal particles ranges from 1 mu m to 10 mu m; the binder is an alcohol binder;
spraying: atomizing the suspension to form liquid drops on a turntable with a certain rotating speed;
and (3) drying: drying the atomized liquid drops to bond at least two raw material particles in the powder material together through the binder to form dry powder particles, or to wrap all or part of single raw material particles in the powder material by the binder to form dry powder particles;
Sintering: introducing the dried powder particles into a sintering chamber for sintering;
and (3) screening: screening the sintered powder particles, and reserving the powder particles with the particle size larger than a preset value, thereby obtaining thermal spraying powder in a particle form;
wherein the metal particles comprise one or more of titanium particles, titanium alloy particles, iron particles, stainless steel particles, low carbon steel particles, high carbon steel particles, cast iron particles, copper alloy particles, aluminum alloy particles, nickel particles, and nickel alloy particles;
the nonmetallic particles are metal oxide particles, and the metal oxide particles comprise one or more of titanium oxide particles, titanium nitride particles, titanium carbide particles, ferroferric oxide particles, ferric oxide particles, ferrous oxide particles, aluminum oxide particles, chromium oxide particles and nickel oxide particles.
5. The method for preparing a thermal spray powder according to claim 4,
the binder comprises a polyvinyl alcohol binder or a polypropylene alcohol binder.
6. The method of producing a thermal spray powder according to claim 4, wherein in the step of sintering, the sintering temperature is in the range of 80 ℃ to 200 ℃ and the sintering time is in the range of 10min to 60min.
7. A cooking appliance, comprising:
a pan body, the surface of the pan body having a corrosion-resistant layer, the corrosion-resistant layer being configured by spraying the thermal spraying powder according to any one of claims 1 to 3 or the thermal spraying powder prepared by the preparation method of the thermal spraying powder according to any one of claims 4 to 6 on the pan body.
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